.editor_tab {
    padding : 0 0 0 0;
    margin : 0 0;
    position:relative;
    /*background: rgb(37,37,37) url("@{image-path}/c9-noise.png");*/
}
.editor_tab.notabs:after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    height: 1px;
    right: 0;
    background: rgba(255,255,255,0.06);
    z-index: 100000;
}

.editor_tab.empty{
    border-right: 1px solid @border-highlight-dark;
    border-left: 1px solid @border-highlight-dark;
    margin-right: -1px;
    margin-left: -1px;
}

.editor_tab .btnsesssioncontainer {
    height: @pane-button-container-height;
    color: #f5f5f5;
    font-family : @pane-button-font-family;
    font-size : @pane-button-font-size;

    background: @pane-background;
    box-shadow: 0 -1px 0 0 @pane-buttons-border-bottom-color inset, 0 1px 0 0 @border-highlight inset, 0 1px 0 @pane-buttons-border-bottom-highlight;
    border: 1px solid @border-highlight-dark;
    border-width : 1px 1px 0 1px;
    position : absolute;
    left : -1px;
    right : -1px;
    top : -1px;
    z-index : 100;
    clip : rect(0, 3000px, (@pane-button-container-height + 3), 0px);

    transition-property: padding-right;
    margin-bottom: 1px;
}
.editor_tab.notabs .btnsesssioncontainer {
    display : none;
}

.editor_tab.morepadding .btnsesssioncontainer{
    padding-right : 53px;
}
/*.dark.editor_tab .btnsesssioncontainer {*/
/*    box-shadow: 0 -1px 0 0 black inset, 0 1px 0 0 rgba(255, 255, 255, .06) inset;*/
/*}*/

.editor_tab .btnsesssioncontainer .inside{
    max-width : 100%;
    padding : @pane-button-container-padding;
    height : @pane-button-container-inner-height;
    overflow-y: hidden;
    overflow-x: hidden;
    .display-flex();
    .flex-direction(row);
}

/* Tab Button (not active) */

.session_btn {
    cursor: default;

    min-width : 6px;
    max-width : @pane-button-max-width;
    .flex(1 1 auto);
    position : relative;
    width : 0;
    line-height : 1.2em;

    padding      : 0 (@pane-button-left-width + 1);
    position     : relative;
    margin-right : @pane-button-margin-right;
    margin-top   : 0;
    height       : @pane-button-height;
    overflow     : hidden;
    /*overflow: visible;*/
    cursor      : default;
}
.session_btn.destroyed{
    min-width: @pane-button-destroyed-width !important;
    max-width: 0px !important;
    padding: 0 !important;
}

.session_btn .tab_middle, .session_btn .tab_shadow {
    height   : @pane-button-height;
    box-sizing: border-box;
    position : relative;
    padding  : 5px 0 0 0;
    overflow: visible;
    color               : #000;

    .image-2x("@{image-path}/@{c9-repeat-x}", 32px, 1500px, repeat-x);
    background-position : 0 -84px;

    /*display : block;*/
    /*overflow : hidden;*/
    text-overflow : ellipsis;
    /*white-space : nowrap;*/

    margin-top: 2px;
    margin-left: -1px;
    margin-right: -1px;
}

.session_btn .tab_shadow{
    position: absolute;
    margin: 0;
    top: 0;
    left: @pane-button-left-width;
    right: @pane-button-right-width;
    bottom: 0;
    background-position: @pane-button-shadow-middle;
    opacity: @pane-button-shadow-opacity;
}

.session_btn .tab_middle:before,
.session_btn .tab_middle:after,
.session_btn .tab_shadow:before,
.session_btn .tab_shadow:after{
    background-color : inherit;
    content          : "";
    display          : block;
    position         : absolute;
    height           : @pane-button-height;
    .image-2x("@{image-path}/@{c9-no-repeat}", @c9-no-repeat-width, @c9-no-repeat-height);
    top              : 0;
}
.session_btn .tab_middle:before,
.session_btn .tab_middle:after{
    -webkit-mask : url("@{image-path}/@{c9-no-repeat-2x}") no-repeat;
    -webkit-mask-size: @c9-no-repeat-width @c9-no-repeat-height;
}
.session_btn .tab_shadow:before{
    left                  : -1 * @pane-button-left-width;
    background-position   : @pane-button-shadow-left;
    opacity: @pane-button-shadow-opacity;
    width            : @pane-button-left-width;
}
.session_btn .tab_shadow:after{
    right                 : -1 * @pane-button-right-width;
    background-position   : @pane-button-shadow-right;
    opacity: @pane-button-shadow-opacity;
    width            : @pane-button-right-width;
}

.session_btn .tab_middle:before {
    left                  : -1 * @pane-button-left-width;
    background-position   : @pane-button-left;
    -webkit-mask-position : @pane-button-mask-left;
    mask : url(#tab-mask-left);
    width            : @pane-button-left-width;
}
.session_btn .tab_middle:after {
    right                 : -1 * @pane-button-right-width;
    background-position   : @pane-button-right;
    -webkit-mask-position : @pane-button-mask-right;
    mask : url(#tab-mask-right);
    width            : @pane-button-right-width;
}

.session_btn:not(.curbtn) .tab_middle,
.session_btn:not(.curbtn) .tab_middle:after,
.session_btn:not(.curbtn) .tab_middle:before{
    background-color    : @pane-button-background;
    -webkit-transition: background-color .15s linear;
}
.session_btn.notrans .tab_middle,
.session_btn.notrans .tab_middle:after,
.session_btn.notrans .tab_middle:before{
    -webkit-transition: none;
}

.session_btn.over:not(.curbtn) .tab_middle,
.session_btn.over:not(.curbtn) .tab_middle:after,
.session_btn.over:not(.curbtn) .tab_middle:before {
    background-color: @pane-button-hover-background;
}

/* Tab Button (active) */

.session_btn.curbtn {
    height      : @pane-button-height + 3;
    z-index     : 10;
    margin-top  : -1px;
}
body>.session_btn.curbtn{
    cursor : default;
    height : @pane-button-height;
}
.session_btn.curbtn .tab_middle {
    height              : @pane-button-height + 1;
    background-position : @pane-button-middle;
    color               : #000;
    padding-top         : 5px;
    margin-top          : 3px;
}
.session_btn.curbtn .tab_middle:before { 
    height: @pane-button-height + 1; 
    background-position : @pane-button-left-active;
}
.session_btn.curbtn .tab_middle:after { 
    height: @pane-button-height + 1; 
    background-position : @pane-button-right-active; 
}

.session_btn.curbtn .tab_shadow {
    background-position : @pane-button-active-shadow-middle;
    opacity : @pane-button-active-shadow-opacity;
}
.session_btn.curbtn .tab_shadow:before{
    background-position : @pane-button-active-shadow-left;
    opacity : @pane-button-active-shadow-opacity;
}
.session_btn.curbtn .tab_shadow:after{
    background-position : @pane-button-active-shadow-right;
    opacity : @pane-button-active-shadow-opacity;
}

.dark.session_btn.curbtn .tab_middle {
    background-position : @pane-button-dark-middle-active;
    margin-top: 2px;
}
.dark.session_btn.curbtn .tab_middle:before { 
    background-position : @pane-button-dark-left-active; 
    -webkit-mask-position : @pane-button-dark-mask-left;
}
.dark.session_btn.curbtn .tab_middle:after { 
    background-position : @pane-button-dark-right-active; 
    -webkit-mask-position : @pane-button-dark-mask-right;
}

/* Tab Title */

.session_btn .sessiontab_title {
    display : block;
    /*position : absolute;*/
    overflow : hidden;
    /*text-overflow : ellipsis;*/
    white-space : nowrap;
    overflow : hidden;
    padding  : @pane-button-title-padding;
       -moz-user-select: -moz-none;
     -khtml-user-select: none;
    -webkit-user-select: none;
         -o-user-select: none;
            user-select: none;
    color : @pane-button-color;
    text-shadow : @pane-button-textshadow;
    // position: relative;
}
.session_btn.btnclose .tab_middle .sessiontab_title {
    margin-right : @pane-button-title-margin-right;
    margin-left : @pane-button-title-margin-left;
}
.session_btn.curbtn .sessiontab_title {
    color : @pane-button-active-color;
    margin-top : -1px;
    text-shadow : none;
    border-bottom: 1px dotted transparent;
}
.dark.session_btn.curbtn .sessiontab_title {
    color : rgba(255,255,255,0.85);
    margin-top : 0;
    text-shadow : 0 1px rgba(0,0,0,.4);
}
.focus.session_btn.curbtn .sessiontab_title {
    height: @pane-button-title-height;
}
.focus.session_btn.curbtn .sessiontab_title when(@pane-button-use-bold-focus = true) {
    font-weight: bold;
    .font-smoothing(true);
    letter-spacing: -0.4px;
}

.focus.session_btn.curbtn .sessiontab_title:after when(@pane-button-use-bold-focus = false) {
    content: "";
    display: block;
    position: absolute;
    bottom: 2px;
    .gradient(~"linear-gradient(left, transparent 0%, rgba(0,0,0,0.2) 15%, rgba(0,0,0,0.2) 30%, transparent 60%)");
    left: -10px;
    right: -10px;
    height: 1px;
    z-index: 1;
}

.focus.session_btn.curbtn.dark .sessiontab_title:after when(@pane-button-use-bold-focus = false) {
    .gradient(~"linear-gradient(left, transparent 0%, rgba(255, 255, 255, 0.19) 15%, rgba(255, 255, 255, 0.19) 30%, transparent 60%)");
}


/* Close Button States (idle, loading, saving, etc) */
/* This section has a delicate sequence. Be careful! */

.session_btn.preview{ font-style: italic }

.session_btn.curbtn strong      { margin-top : -1px; background-position : 0 0; }
.dark.session_btn.curbtn strong { margin-top : 1px !important; background-position : 0 -14px; }

.has_apf .session_btn.changed strong,
.has_apf .session_btn.saving strong,
.has_apf .session_btn.saved strong,
.has_apf .session_btn.conflict strong,
.has_apf .session_btn.error strong {
    .image-2x("@{image-path}/@{pane-button-states-image}", (4 * @pane-button-states-image-size), @pane-button-states-image-size);
    background-position: 0 2px;
    width      : @pane-button-states-image-size;
    height     : 11px;
    right      : @pane-button-states-right;
    top        : @pane-button-states-top;
    margin-top : 0px;

    .animation(none);
}
.has_apf .session_btn.changed strong { background-position : 0 0; }
.has_apf .session_btn.error strong { background-position : (-1 * @pane-button-states-image-size) 0; }
.has_apf .session_btn.saving strong { background-position : (-2 * @pane-button-states-image-size) 0; }
.has_apf .session_btn.saved strong { background-position : (-3 * @pane-button-states-image-size) 0; }
.has_apf .session_btn.conflict strong { background-position : (-2 * @pane-button-states-image-size) 0; }

.asterisk .session_btn.changed .sessiontab_title:before {content: "*";}

.has_apf .session_btn.running strong{
    .image-2x(@pane-button-running-image, @pane-button-running-image-width, @pane-button-running-image-height, no-repeat);
    .animation(@pane-button-running-animation);

    height     : @pane-button-running-width;
    width      : @pane-button-running-height;
    right      : @pane-button-running-right;
    top        : @pane-button-running-top;
    z-index    : 10;
}

.has_apf .session_btn.loading strong,
.has_apf .session_btn.connecting strong{
    .image-2x(@pane-button-save-image, @pane-button-save-image-width, @pane-button-save-image-height, no-repeat);
    .animation(@pane-button-save-animation);

    height     : @pane-button-save-width;
    width      : @pane-button-save-height;
    right      : @pane-button-save-right;
    top        : @pane-button-save-top;
    z-index    : 10;
}

.session_btn strong,
.has_apf .session_btn strong:hover,
.has_apf .session_btn strong:active,
.has_apf .session_btn.curbtn strong:hover,
.has_apf .session_btn.curbtn strong:active {
    width       : 14px;
    height      : 14px;
    display     : block;
    position    : absolute;
    right       : @pane-button-close-right;
    top         : @pane-button-close-top;
    .image-2x(@pane-button-close-image, @pane-button-close-image-width, @pane-button-close-image-height);
    background-position: 0 @pane-button-close-background;

    cursor      : pointer;
    z-index     : 10;
    margin-top  : @pane-button-close-hack;

    .animation(none)
}

.has_apf .session_btn strong:hover  { background-position : -14px @pane-button-close-background; }
.has_apf .session_btn strong:active { background-position : -28px @pane-button-close-background; }
.has_apf .session_btn.curbtn strong:hover       { margin-top : -1px; background-position : -14px 0; }
.has_apf .session_btn.curbtn strong:active      { margin-top : -1px; background-position : -28px 0; }
.has_apf .dark.session_btn.curbtn strong:hover  { margin-top : 1px; background-position : -14px -14px; }
.has_apf .dark.session_btn.curbtn strong:active { margin-top : 1px; background-position : -28px -14px; }

/* Other */

.has_apf .plus_tab_button {
    display: inline-block;
    margin: @pane-plus-margin;
    top: 3px;
    vertical-align : top;
    .box-sizing(border-box);

    position: relative;
    cursor: default;

    .skew(23deg);
    border-radius: 4px 3px 4px 2px;
    border: @pane-plus-box-border;
    .box-shadow(~"@{pane-plus-box-shadow}");
    width: @pane-plus-width;
    height: @pane-plus-height;
    z-index: 100000;
}
.has_apf .plus_tab_button:after {
    content: "";
    display : block;
    width : @pane-plus-icon-width;
    height : @pane-plus-icon-height;
    .image-2x("@{image-path}/@{pane-plus-icon}", @pane-plus-icon-image-width, @pane-plus-icon-image-height);
    .skew(-23deg);
    margin : @pane-plus-icon-margin;
    background-position: @pane-plus-icon-idle-position;
}
.plus_tab_button.c9-simple-btnOver {
    border: 1px solid @pane-plus-hover-border-color;
    .box-shadow(~"@{pane-plus-hover-box-shadow}");
    .gradient(~"@{pane-plus-hover-gradient}");
}
.plus_tab_button.c9-simple-btnOver:after{
    background-position: @pane-plus-icon-hover-position;
}
.plus_tab_button.c9-simple-btnDown {
    border: 1px solid @pane-plus-active-border-color;
    .box-shadow(~"@{pane-plus-active-box-shadow}");
    .gradient(~"@{pane-plus-active-gradient}");
}
.plus_tab_button.c9-simple-btnDown:after {
    background-position: @pane-plus-icon-active-position;
}
.has_apf .plus_tab_button.c9-simple-btnOver:after,
.has_apf .plus_tab_button.c9-simple-btnDown:after{
    margin : @pane-plus-hover-margin;
}

.has_apf .tabmenubtn {
    left: @pane-menu-left;
    position: absolute;
    top: @pane-menu-top;
    width: 19px;

    .box-sizing(border-box);
    border-radius: 3px;
    height: 16px;
    border: 1px solid @pane-menu-border-color;
    .box-shadow(~"@{pane-menu-box-shadow}");
    .gradient(~"@{pane-menu-gradient}");
}
.has_apf .tabmenubtn:after {
    content: "";
    display : block;
    width : @pane-menu-icon-width;
    height : @pane-menu-icon-height;
    .image-2x("@{image-path}/@{pane-menu-icon}", @pane-menu-icon-image-width, @pane-menu-icon-image-height);
    margin : 2px 0 0 1px;
    background-position: @pane-menu-icon-position;
}
.has_apf .tabmenubtn.c9-simple-btnOver {
    border: 1px solid @pane-menu-hover-border-color;
    .box-shadow(~"@{pane-menu-hover-box-shadow}");
    .gradient(~"@{pane-menu-hover-gradient}");
}
.has_apf .tabmenubtn.c9-simple-btnOver:after{
    background-position: @pane-menu-icon-hover-position;
}
.has_apf .tabmenubtn.c9-simple-btnDown {
    height : 17px;
}
.has_apf .tabmenubtn.c9-simple-btnDown:after {
    background-position: @pane-menu-icon-active-position;
}
.tabsContextMenu{
    overflow: visible !important;
    margin: @pane-menu-margin !important;
}
.tabsContextMenu:before {
    border: 1px solid @pane-menu-active-border-color;
    border-width : 1px 1px 0 1px;
    .box-shadow(~"@{pane-menu-active-box-shadow}");
    .gradient(~"@{pane-menu-active-gradient}");

    .box-sizing(border-box);
    border-radius: 3px 3px 0 0;
    content: "";
    display: block;
    left: -1px;
    pointer-events: none;
    position: absolute;
    top: @pane-menu-button-top;
    width: @pane-menu-button-width;
    height : @pane-menu-button-height;
}
.tabsContextMenu:after {
    content: "";
    display : block;
    width : 23px; //14px;
    height : @pane-menu-button-height; //11px;
    .image-2x("@{image-path}/@{pane-menu-icon}", @pane-menu-icon-image-width, @pane-menu-icon-image-height);
    margin : @pane-menu-button-margin;
    position : absolute;
    top : @pane-menu-button-top;
    background-position: @pane-menu-button-background-position;
}
.upward.tabsContextMenu:before{
    border-width : 0px 1px 1px 1px;
    .box-shadow(~"@{pane-menu-upward-active-box-shadow}");
    .gradient(~"@{pane-menu-upward-active-gradient}");
    border-radius: 0 0 3px 3px;

    top: auto;
    bottom : @pane-menu-button-up-bottom;
    height : @pane-menu-button-up-height;
}

.codeditorHolder .editor_tab {
    background: @pane-background;
}

.codeditorHolder>.vsplitbox, .codeditorHolder>.hsplitbox{
    height: 100%;
}

/* Page */

.editor_tab .session_page {
    display : none;
    position : absolute;
    top : @pane-button-container-height;
    bottom : 0;
    left : 0;
    right : 0;
    z-index : 10;
    margin: 0 auto;
    padding-top:7px;
    overflow : hidden;
    // background : #252525;
}
.editor_tab.notabs .session_page{
    top : 0;
}
.editor_tab .session_page.curpage{
    display : block;
}